7521Plus / N N/B MAINTENANCE
8.1 NO POWER:
Symptom:
When the power button is pressed, nothing happens, no fan activity is heard and power indicatordicator isis notnot lightlight upup..
CONTINUE
2.Check the power source from AC adapter. (PJ501)
SIGNAL: PARTS:
ADINP | PL501 | PC509 | PR15 | PR16 | |
PF501 | PD501 | PR14 | PD3 | ||
LEARING | |||||
PC2 | PU2 | PR13 …….. | |||
| |||||
NO
POWER
OK?
YES
END
If “D/VMAIN” failure.
If “VDD5” failure.
If “VCC_CORE” (CPUVCC) failure.
If “+S12V, +S5V_P or +S3V_P” failure.
If “1.5V, 1.8V”
Failure.
CHECK: PD3,PD4,PL3,PR20,PR21,PQ12, PU9,PR23,PC58,PC57…….
CHECK : PD1,PD2,F2,U32,C247,Q22....
CHECK: PL12,PU18,PU12,PU19,PU20, PU22,PU23,PL11,PD21,PR79, PR80,PC122,PC119,PC123,….
CHECK : PU10,PQ502,PQ503,PQ7, PQ9,PL504,PD505,PU501, PD502,PL503,PR1,PL502, PR3,PD504…….
CHECK: PU14,PU4,PU5,PD7,PD8,PD10, PD11,PD15,PL5,PL6,PR32,PR35 ,PR46,PR47,PR41,PR42….
107
